Thanks for that additional information. What I was hoping to find, and it's probably lost to history, is the work done at the various stops in the US before going overseas. But, the "Ugly A" code was baffling and despite searching numerous different ways, was unable to come up with anything. My guess was that it was some sort of depot in the UK, but most references refer to Burtonwood (BAD). I had previously posted looking for information on the addition of the cheek gun positions which replace the flush gun positions for the bombardier and navigator. Whether these were installed at the Boeing factory or at a field modification center. From reading Simons and Friedman's book, it appears the cheek gun mod was incorporated in the block 50 aircraft onward which leads me to think that 42-30211 had them leaving Boeing. I've found a photo of 30212 (later converted to an Aphrodite aircraft) which has the cheek guns but the photo is dated later in 1943...and I am specifically looking for the May/June 1943 period.